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When an old game tries to call a DirectX 9 function, and your PC only has DirectX 12, you get the dreaded “missing DLL” error.

DirectX can only talk to the hardware if the driver (the hardware's instruction manual) is written in the same language. Update your GPU driver, and you will likely see the performance boost you were looking for.

DirectX 12 (and its updates) does not have a standalone download package for Windows 10. Instead, Microsoft delivers these updates through regular system patches: Which version of DirectX is on your PC? - Microsoft Support

Microsoft DirectX® is already included in Windows XP Service Pack 2, Windows Server 2003 Service Pack 1, Windows Vista, Windows 7, Microsoft How to determine the version of DirectX by using ... - Microsoft Support More Information. To use the DirectX Diagnostic Tool to determine the version of DirectX that is installed on your computer, follo... Microsoft Support DirectX End-User Runtime Web Installer - Microsoft Click the Download button on this page to start the download, or choose a different language from the drop-down list and click Go. Microsoft [RESOLVED] DirectX not installing on Windows 10 - Microsoft Q&A Dec 11, 2018 —

While Windows 10 includes DirectX 12, many older games (from the XP, Vista, or Windows 7 era) were built for . These older versions used different file formats (specifically .dll files) that are not fully included in a clean Windows 10 installation.